You can pick out the personality of your audience, and then find different traits using the specific personality quadrant. This application is a bit complicated due to the tremendous amount of information that you can access, but it will tell you what key points to hit on when talking to a customer.
On the other side of the fence, you, as a customer, might want to check this application out, so sales people don't stick you with lemons.
Tucows, Inc has graciously donated a copy of this software to the Internet Archive's Tucows Software Archive for long term preservation and access. Please check the Tucows website for all current versions of the software.